Episcleritis is irritation and swelling (inflammation) of the episclera, a thin layer of tissue covering the sclera of the eye.

The sclera is made up of of tissue fibers that form the strong white wall of the eye. It is covered by the episclera, a thin layer of tissue that contains many blood vessels that feed the sclera.

Episcleritis is inflammation of the episclera that occurs without an infection. It is a common condition that is usually mild and rarely progresses to scleritis.

The cause is usually unknown, but it may occur with certain diseases, such as:

• Herpes zoster
• Rheumatoid arthritis
• Sjogren syndrome
• Syphilis
• Tuberculosis

• A pink or purple color to the normally white part of the eye
• Eye pain
• Eye tenderness
• Sensitivity to light
• Tearing of the eye

An eye examination can usually diagnose the disorder. No special tests are usually necessary.

The condition usually disappears without treatment in 1 - 2 weeks. Treatment with corticosteroid eye drops may relieve the symptoms faster.

Episcleritis usually improves without treatment. Treatment may shorten its duration.

• Rarely, scleritis may develop
• The condition may return

Call your health care provider if you have symptoms of episcleritis that last for more than 2 weeks. Get checked again if your pain worsens or you lose vision.

Goldstein DA, Tessler HH. Episcleritis, Scleritis, and Other Scleral Disorders. In: Yanoff M, Duker JS, Augsburger JJ, Azar DT. Yanoff: Ophthalmology. 2nd ed. Philadelphia, Pa: Mosby; 2004:chap 64.

O'Day DM, Horn JD. The Eye and Rheumatic Disease. In: Harris ED, Budd RC, Genovese MC, Firestein GS, Sargent JS. Harris: Kelley's Textbook of Rheumatology. 7th ed. Philadelphia, Pa: Saunders Elsevier; 2005:chap 44.